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Possible Duplicate:
Is there any way to see why Outlook's client junk mail filter is marking a message as spam?

My Question:

How does Outlook 2007 decide if it should redirect an e-mail to the Junk E-mail folder?

Background Story: When I send a simple HTML e-mail from my domain mailbox, it's being redirected to the Junk E-mail folder.

Here are two sub questions:

  1. Does Outlook 2007 care if the sender's outbound mailbox's reverse PTR is incorrectly configured? [If so, how can it check?]
  2. Does Outlook 2007 care if the sender doesn't provide a plain text version of the HTML content?

It turns out, I'm not the only one wondering about Outlook's junk algorithm. See the comments attached to this answer.

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marked as duplicate by voretaq7 Jul 19 '12 at 19:17

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

There are long lists of weights & scores & reasons emails are dumped into the junk box. Unfortunately, that information isn't published. If it was, any spammer could go through the rules & craft emails that would slip through the cracks fairly easily.

If you're trying to keep emails in your network from entering users' junk boxes, you can setup "safe-sender" lists & deploy them via GPO...

If you are sending emails to another office & they're incorrectly being marked as junk... you're going to have a hard time overcoming this. Generally, you need to look at your email, and verify all the details appear accurate (doubly-so in the message headers) Look for things like the sent date & time are not unrealistic... check on common spam sender lists to see if your domain/ip is not blacklisted... is a good tool for that.

Also avoid common spam phrases like "advertisement" and "viagra" in the subject lines. Email addresses with numbers in the first 8 characters are also a common red-flag. There's a few lists out there with more info, but here's a pretty short one:

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Here's a helpful answer.

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